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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/75

Authors: Abera, Shiferaw
Date Added: 6-Sep-2007
Abstract: Most of the phenomenon performed by active galaxies are left uncovered among which highly collimated jet-like out°ows, that span hounders of Kpc to Mpc via interstellar medium, is the one. Our current research, which is fully analytic, is targeted on ¯nding the plausible mechanism of jets generation and collimation in these Mysterious active galaxies. In this work, Kerr geometry is preferred to describe the dynamics of electromagnetic ¯eld and plasma °uid around rotating Kerr black hole. we ¯nd out that the force-free region, in the immediate neighborhood of rotating black hole, is the site where jets generation and launching are fabricated. Toroidal magnetic ¯eld and centrifugal force, on the accreting plasma °uid, are the key elements for the generation and launching of jets. Collimation of jets is the responsibility of: magnetic hoop stress, radiation pressure, from the accretion disk, and centrifugal force. Also, magnetic ¯eld is found to be crucially important in extracting the spin energy of the black hole. Energy and angular momentum are continuously supplied to the jets through di®erential rotation.
Description: A thesis submitted to the School of Graduate Studies of ADDIS ABABA UNIVERSITY In partial ful¯llment of the Requirements for the degree of MASTER OF SCIENCE In PHYSICS
URI: http://hdl.handle.net/123456789/75
Appears in:Thesis - Physics

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